September 13th, 2006, 10:56 pm
It's kind of silly to answer my own question, but the CodePharm's Galapagos does optimization of synthetic CDO tranches to "optimize" CDO tranche ratings and spreads, by running huge iteration between portfolio CDS spreads, market correlation, and tranche rating. Apparently, the system runs the rating agencies' model to assess the tranche rating, while maximizing the spreads allocated to the tranche. i.e., not just optimizing the reference portfolio by picking widest names with minimum WARF but optimizing the reference portfolio for a specific tranche at the specific position in the capital structure.